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          LV10-10-platform-02-三种匹配方式
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<h1 id="一、匹配方式介绍"><a href="#一、匹配方式介绍" class="headerlink" title="一、匹配方式介绍"></a><font size=3>一、匹配方式介绍</font></h1><h2 id="1-匹配函数"><a href="#1-匹配函数" class="headerlink" title="1. 匹配函数"></a><font size=3>1. 匹配函数</font></h2><p>在上一篇笔记中已经找过这个匹配函数了，<code>platform</code>匹配函数定义在<code>linux</code>内核源码的下边这个文件中：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">drivers/base/platform.c</span><br></pre></td></tr></table></figure>

<p>我们打开这文件可以看到这个函数定义如下：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="type">int</span> <span class="title function_">platform_match</span><span class="params">(<span class="keyword">struct</span> device *dev, <span class="keyword">struct</span> device_driver *drv)</span></span><br><span class="line">&#123;</span><br><span class="line">        <span class="class"><span class="keyword">struct</span> <span class="title">platform_device</span> *<span class="title">pdev</span> =</span> to_platform_device(dev);</span><br><span class="line">        <span class="class"><span class="keyword">struct</span> <span class="title">platform_driver</span> *<span class="title">pdrv</span> =</span> to_platform_driver(drv);</span><br><span class="line"></span><br><span class="line">        <span class="comment">/* Attempt an OF style match first */</span></span><br><span class="line">        <span class="keyword">if</span> (of_driver_match_device(dev, drv))</span><br><span class="line">                <span class="keyword">return</span> <span class="number">1</span>;</span><br><span class="line"></span><br><span class="line">        <span class="comment">/* Then try ACPI style match */</span></span><br><span class="line">        <span class="keyword">if</span> (acpi_driver_match_device(dev, drv))</span><br><span class="line">                <span class="keyword">return</span> <span class="number">1</span>;</span><br><span class="line"></span><br><span class="line">        <span class="comment">/* Then try to match against the id table */</span></span><br><span class="line">        <span class="keyword">if</span> (pdrv-&gt;id_table)</span><br><span class="line">                <span class="keyword">return</span> platform_match_id(pdrv-&gt;id_table, pdev) != <span class="literal">NULL</span>;</span><br><span class="line"></span><br><span class="line">        <span class="comment">/* fall-back to driver name match */</span></span><br><span class="line">        <span class="keyword">return</span> (<span class="built_in">strcmp</span>(pdev-&gt;name, drv-&gt;name) == <span class="number">0</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h2 id="2-匹配方式"><a href="#2-匹配方式" class="headerlink" title="2. 匹配方式"></a><font size=3>2. 匹配方式</font></h2><p>我们从匹配函数中可以看到，应该有四种匹配方式，但是有一种我们似乎基本们怎么用过，所以这里就只讨论三种匹配方式：</p>
<ul>
<li>名称匹配</li>
</ul>
<p>一个驱动只对应一个设备，它是最简单的匹配方式，优先级最低。</p>
<ul>
<li><code>id</code>匹配（可想象成八字匹配）</li>
</ul>
<p>一个驱动可以对应多个设备，优先级高于名称匹配，但是低于设备树匹配。</p>
<p><code>device</code>模块中，<code>id</code>的<code>name</code>成员必须与<code>struct platform_device</code>中的<code>name</code>成员内容一致。因此<code>device</code>模块中，<code>struct platform_device</code>中的<code>name</code>成员必须指定。</p>
<p><code>driver</code>模块中，<code>struct platform_driver</code>成员<code>driver</code>的<code>name</code>成员必须指定，但与<code>device</code>模块中<code>name</code>可以不相同。</p>
<ul>
<li>设备树匹配</li>
</ul>
<p>内核启动时根据设备树自动产生的设备，优先级最高。我们一般会使用设备树的使用<code>compatible</code>属性进行匹配，注意设备树中<code>compatible</code>属性值<strong>不要包含空白字符</strong>。<code>id_table</code>可不设置，但<code>struct platform_driver</code>成员<code>driver</code>的<code>name</code>成员必须设置。</p>
<h1 id="二、名称匹配框架"><a href="#二、名称匹配框架" class="headerlink" title="二、名称匹配框架"></a><font size=3>二、名称匹配框架</font></h1><h2 id="1-hello-app-c"><a href="#1-hello-app-c" class="headerlink" title="1. hello_app.c"></a><font size=3>1. <code>hello_app.c</code></font></h2><details class="folding-tag" blue><summary> 点击查看详情 </summary>
              <div class='content'>
              <figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** =====================================================</span></span><br><span class="line"><span class="comment"> * Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"> * File name  : hello_app.c</span></span><br><span class="line"><span class="comment"> * Author     : qidaink</span></span><br><span class="line"><span class="comment"> * Date       : 2022-08-29</span></span><br><span class="line"><span class="comment"> * Version    : </span></span><br><span class="line"><span class="comment"> * Description: platform总线驱动 —— 名称匹配基础框架测试APP</span></span><br><span class="line"><span class="comment"> * Others     : </span></span><br><span class="line"><span class="comment"> * Log        : </span></span><br><span class="line"><span class="comment"> * ======================================================</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdio.h&gt;</span>     <span class="comment">/* printf */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/types.h&gt;</span> <span class="comment">/* open */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/stat.h&gt;</span>  <span class="comment">/* open */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;fcntl.h&gt;</span>     <span class="comment">/* open */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;unistd.h&gt;</span>    <span class="comment">/* close sleep */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/ioctl.h&gt;</span> <span class="comment">/* ioctl */</span></span></span><br><span class="line"></span><br><span class="line"><span class="type">int</span> <span class="title function_">main</span><span class="params">(<span class="type">int</span> argc, <span class="type">char</span> *argv[])</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 0.相关变量定义 */</span></span><br><span class="line">    <span class="type">int</span> fd = <span class="number">-1</span>;     <span class="comment">/* 文件描述符 */</span></span><br><span class="line">    <span class="comment">/* 1.判断参数个数是否合法 */</span></span><br><span class="line">    <span class="comment">/* 1.1判断参数数量 */</span></span><br><span class="line">    <span class="keyword">if</span> (argc &lt; <span class="number">2</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">&quot;\nusage:\n&quot;</span>);</span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">&quot;%s /dev/dev_name\n&quot;</span>, argv[<span class="number">0</span>]);</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">/* 2.打开字符设备 */</span></span><br><span class="line">    <span class="keyword">if</span> ((fd = open(argv[<span class="number">1</span>], O_RDWR)) &lt; <span class="number">0</span>) <span class="comment">/* 默认是阻塞的 */</span></span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">&quot;open %s failed!\n&quot;</span>, argv[<span class="number">1</span>]);</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 4.关闭字符设备 */</span></span><br><span class="line">    close(fd);</span><br><span class="line">    fd = <span class="number">-1</span>;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
              </div>
            </details>

<h2 id="2-hello-device-c"><a href="#2-hello-device-c" class="headerlink" title="2. hello_device.c"></a><font size=3>2. <code>hello_device.c</code></font></h2><details class="folding-tag" blue><summary> 点击查看详情 </summary>
              <div class='content'>
              <figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** =====================================================</span></span><br><span class="line"><span class="comment"> * Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"> * File name  : hello_device.c</span></span><br><span class="line"><span class="comment"> * Author     : qidaink</span></span><br><span class="line"><span class="comment"> * Date       : 2022-08-29</span></span><br><span class="line"><span class="comment"> * Version    :</span></span><br><span class="line"><span class="comment"> * Description: platform总线驱动设备程序 —— 名称匹配基础框架</span></span><br><span class="line"><span class="comment"> * Others     :</span></span><br><span class="line"><span class="comment"> * Log        :</span></span><br><span class="line"><span class="comment"> * ======================================================</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="comment">/** 头文件 */</span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/module.h&gt;</span>          <span class="comment">/* MODULE_LICENSE */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/kernel.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/init.h&gt;</span>            <span class="comment">/* module_init module_exit */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/platform_device.h&gt;</span></span></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 宏定义 */</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> MODULE_NAME <span class="string">&quot;hello&quot;</span> <span class="comment">/* 模块名称 */</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 平台总线相关 */</span></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @Function   : hello_device_release</span></span><br><span class="line"><span class="comment"> * @brief      : 删除设备</span></span><br><span class="line"><span class="comment"> * @param pdev : struct device * 类型</span></span><br><span class="line"><span class="comment"> * @return     : none</span></span><br><span class="line"><span class="comment"> * @Description: 函数名赋值给 struct platform_device 结构体的 .dev.release 成员</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="type">void</span> <span class="title function_">hello_device_release</span><span class="params">(<span class="keyword">struct</span> device *pdev)</span></span><br><span class="line">&#123;</span><br><span class="line">    printk(<span class="string">&quot;[INFO]hello_device_release is called!\n&quot;</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/** </span></span><br><span class="line"><span class="comment"> *  定义资源数组(注意不能有重叠区域，否则会报错：failed to claim resource 2/3/4/5)</span></span><br><span class="line"><span class="comment"> *  结构体变量名赋值给 struct platform_device 结构体的 .resource 成员</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">resource</span> <span class="title">hello_device_res</span>[] =</span> &#123;</span><br><span class="line">    [<span class="number">0</span>] = &#123;.start = <span class="number">0x1000</span>, .end = <span class="number">0x1003</span>, .name = <span class="string">&quot;reg1&quot;</span>, .flags = IORESOURCE_MEM&#125;,</span><br><span class="line">    [<span class="number">1</span>] = &#123;.start = <span class="number">0x2000</span>, .end = <span class="number">0x2003</span>, .name = <span class="string">&quot;reg2&quot;</span>, .flags = IORESOURCE_MEM&#125;,</span><br><span class="line">    [<span class="number">2</span>] = &#123;.start =     <span class="number">10</span>, .end =     <span class="number">10</span>, .name = <span class="string">&quot;irq1&quot;</span>, .flags = IORESOURCE_IRQ&#125;,</span><br><span class="line">    [<span class="number">3</span>] = &#123;.start = <span class="number">0x3000</span>, .end = <span class="number">0x3003</span>, .name = <span class="string">&quot;reg3&quot;</span>, .flags = IORESOURCE_MEM&#125;,</span><br><span class="line">    [<span class="number">4</span>] = &#123;.start =    <span class="number">100</span>, .end =    <span class="number">100</span>, .name = <span class="string">&quot;irq2&quot;</span>, .flags = IORESOURCE_IRQ&#125;,</span><br><span class="line">    [<span class="number">5</span>] = &#123;.start =     <span class="number">62</span>, .end =     <span class="number">62</span>, .name = <span class="string">&quot;irq3&quot;</span>, .flags = IORESOURCE_IRQ&#125;,</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">/** 定义platform平台设备 */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">platform_device</span> <span class="title">hello_device</span> =</span> &#123;</span><br><span class="line">    .name = MODULE_NAME,                 <span class="comment">/* 必须初始化 name 成员 */</span></span><br><span class="line">    .dev.release = hello_device_release, <span class="comment">/* 删除设备 */</span></span><br><span class="line">    .resource = hello_device_res,        <span class="comment">/* 资源数组 */</span></span><br><span class="line">    .num_resources = ARRAY_SIZE(hello_device_res), <span class="comment">/* 资源数组元素个数 */</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 整个模块相关 */</span></span><br><span class="line"><span class="comment">/* 驱动入口函数 */</span></span><br><span class="line"><span class="type">int</span> __init <span class="title function_">hello_device_init</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 1.注册：把指定设备添加到内核中平台总线的设备列表，等待匹配，匹配成功则会调用驱动(driver)中 probe */</span></span><br><span class="line">    platform_device_register(&amp;hello_device);</span><br><span class="line">    <span class="comment">/* 2.打印加载模块的提示信息 */</span></span><br><span class="line">    printk(<span class="string">&quot;[INFO]This module [%s](device) is loaded!\n&quot;</span>, MODULE_NAME);</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 驱动出口函数 */</span></span><br><span class="line"><span class="type">void</span> __exit <span class="title function_">hello_device_exit</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 1.注销：把指定设备从设备列表中删除 */</span></span><br><span class="line">    platform_device_unregister(&amp;hello_device);</span><br><span class="line">    <span class="comment">/* 2.打印卸载模块的提示信息 */</span></span><br><span class="line">    printk(<span class="string">&quot;[INFO]This module [%s](device) is exited!\n&quot;</span>, MODULE_NAME);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 将上面两个函数指定为驱动的入口和出口函数 */</span></span><br><span class="line">module_init(hello_device_init);</span><br><span class="line">module_exit(hello_device_exit);</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 模块信息(通过 modinfo module_name 查看) */</span></span><br><span class="line">MODULE_LICENSE(<span class="string">&quot;GPL&quot;</span>);                        <span class="comment">/* 源码的许可证协议 */</span></span><br><span class="line">MODULE_AUTHOR(<span class="string">&quot;qidaink&quot;</span>);                     <span class="comment">/* 字符串常量内容为模块作者说明 */</span></span><br><span class="line">MODULE_DESCRIPTION(<span class="string">&quot;Description&quot;</span>);            <span class="comment">/* 字符串常量内容为模块功能说明 */</span></span><br><span class="line">MODULE_ALIAS(<span class="string">&quot;module&#x27;s other name&quot;</span>);          <span class="comment">/* 字符串常量内容为模块别名 */</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
              </div>
            </details>

<h2 id="3-hello-driver-c"><a href="#3-hello-driver-c" class="headerlink" title="3. hello_driver.c"></a><font size=3>3. <code>hello_driver.c</code></font></h2><details class="folding-tag" blue><summary> 点击查看详情 </summary>
              <div class='content'>
              <figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** =====================================================</span></span><br><span class="line"><span class="comment"> * Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"> * File name  : hello_driver.c</span></span><br><span class="line"><span class="comment"> * Author     : qidaink</span></span><br><span class="line"><span class="comment"> * Date       : 2022-08-29</span></span><br><span class="line"><span class="comment"> * Version    :</span></span><br><span class="line"><span class="comment"> * Description: platform总线驱动驱动程序 —— 名称匹配基础框架</span></span><br><span class="line"><span class="comment"> * Others     :</span></span><br><span class="line"><span class="comment"> * Log        :</span></span><br><span class="line"><span class="comment"> * ======================================================</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="comment">/** 头文件 */</span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/module.h&gt;</span>           <span class="comment">/* MODULE_LICENSE */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/kernel.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/init.h&gt;</span>            <span class="comment">/* module_init module_exit */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/platform_device.h&gt;</span> <span class="comment">/* platform_get_resource */</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 宏定义 */</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> MODULE_NAME <span class="string">&quot;hello&quot;</span> <span class="comment">/* 模块名称 */</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 平台驱动相关 */</span></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @Function       : hello_driver_probe</span></span><br><span class="line"><span class="comment"> * @brief          : 设备和驱动匹配成功之后的调用函数</span></span><br><span class="line"><span class="comment"> * @param p_pltdev : struct device * 类型</span></span><br><span class="line"><span class="comment"> * @return         : int 类型</span></span><br><span class="line"><span class="comment"> * @Description    : 函数名赋值给 struct platform_driver 结构体的 .probe 成员</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">hello_driver_probe</span><span class="params">(<span class="keyword">struct</span> platform_device *p_pltdev)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 0.相关变量定义 */</span></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">resource</span> *<span class="title">pres</span> =</span> <span class="literal">NULL</span>; <span class="comment">/* 暂存资源 */</span></span><br><span class="line">    <span class="type">int</span> i = <span class="number">0</span>;</span><br><span class="line">    <span class="comment">/* 1.获取设备寄存器资源 */</span></span><br><span class="line">    printk(<span class="string">&quot;=====================================================\n&quot;</span>);</span><br><span class="line">    <span class="keyword">for</span>(i = <span class="number">0</span>; i &lt; <span class="number">3</span>; i++)</span><br><span class="line">    &#123;</span><br><span class="line">        pres = platform_get_resource(p_pltdev, IORESOURCE_MEM, i);</span><br><span class="line">        printk(<span class="string">&quot;IORESOURCE_MEM[%d]start=0x%x,end=0x%x,name=%s\n&quot;</span>, i,(<span class="type">unsigned</span> <span class="type">int</span>)pres-&gt;start, (<span class="type">unsigned</span> <span class="type">int</span>)pres-&gt;end, pres-&gt;name);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">/* 2.获取中断号资源 */</span></span><br><span class="line">    <span class="keyword">for</span>(i = <span class="number">0</span>; i &lt; <span class="number">3</span>; i++)</span><br><span class="line">    &#123;</span><br><span class="line">        pres = platform_get_resource(p_pltdev, IORESOURCE_IRQ, i);</span><br><span class="line">        printk(<span class="string">&quot;IORESOURCE_IRQ[%d]start=0x%x,end=0x%x,name=%s\n&quot;</span>, i,(<span class="type">int</span>)pres-&gt;start, (<span class="type">int</span>)pres-&gt;end, pres-&gt;name);</span><br><span class="line">    &#125;</span><br><span class="line">    printk(<span class="string">&quot;=====================================================\n&quot;</span>);</span><br><span class="line">    <span class="comment">/* 打印提示信息 */</span></span><br><span class="line">    printk(<span class="string">&quot;[INFO]hello_driver_probe is called!\n&quot;</span>);</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @Function       : hello_driver_remove</span></span><br><span class="line"><span class="comment"> * @brief          : 卸载设备</span></span><br><span class="line"><span class="comment"> * @param p_pltdev : struct platform_device * 类型</span></span><br><span class="line"><span class="comment"> * @return         : int 类型</span></span><br><span class="line"><span class="comment"> * @Description    : 函数名赋值给 struct platform_driver 结构体的 .remove 成员</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">hello_driver_remove</span><span class="params">(<span class="keyword">struct</span> platform_device *p_pltdev)</span></span><br><span class="line">&#123;</span><br><span class="line">    printk(<span class="string">&quot;[INFO]hello_driver_remove is called!\n&quot;</span>);</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/** 定义platform平台驱动 */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">platform_driver</span> <span class="title">hello_driver</span> =</span> &#123;</span><br><span class="line">    .driver = &#123;</span><br><span class="line">        .name = MODULE_NAME,       <span class="comment">/* 必须初始化 name 成员 */</span></span><br><span class="line">    &#125;,</span><br><span class="line">    .probe = hello_driver_probe,   <span class="comment">/* 设备和驱动匹配成功之后的调用函数 */</span></span><br><span class="line">    .remove = hello_driver_remove, <span class="comment">/* 卸载设备 */</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 整个模块相关 */</span></span><br><span class="line"><span class="comment">/* 驱动入口函数 */</span></span><br><span class="line"><span class="type">int</span> __init <span class="title function_">hello_driver_init</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 1.注册平台设备驱动 */</span></span><br><span class="line">    platform_driver_register(&amp;hello_driver);</span><br><span class="line">    <span class="comment">/* 2.打印加载模块的提示信息 */</span></span><br><span class="line">    printk(<span class="string">&quot;[INFO]This module [%s](driver) is loaded!\n&quot;</span>, MODULE_NAME);</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 驱动出口函数 */</span></span><br><span class="line"><span class="type">void</span> __exit <span class="title function_">hello_driver_exit</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 1.注销平台设备驱动 */</span></span><br><span class="line">    platform_driver_unregister(&amp;hello_driver);</span><br><span class="line">    <span class="comment">/* 2.打印卸载模块的提示信息 */</span></span><br><span class="line">    printk(<span class="string">&quot;[INFO]This module [%s](driver) is exited!\n&quot;</span>, MODULE_NAME);</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">/* 将上面两个函数指定为驱动的入口和出口函数 */</span></span><br><span class="line">module_init(hello_driver_init);</span><br><span class="line">module_exit(hello_driver_exit);</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 模块信息(通过 modinfo module_name 查看) */</span></span><br><span class="line">MODULE_LICENSE(<span class="string">&quot;GPL&quot;</span>);                        <span class="comment">/* 源码的许可证协议 */</span></span><br><span class="line">MODULE_AUTHOR(<span class="string">&quot;qidaink&quot;</span>);                     <span class="comment">/* 字符串常量内容为模块作者说明 */</span></span><br><span class="line">MODULE_DESCRIPTION(<span class="string">&quot;Description&quot;</span>);            <span class="comment">/* 字符串常量内容为模块功能说明 */</span></span><br><span class="line">MODULE_ALIAS(<span class="string">&quot;module&#x27;s other name&quot;</span>);          <span class="comment">/* 字符串常量内容为模块别名 */</span></span><br><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>
              </div>
            </details>

<h2 id="4-Makefile"><a href="#4-Makefile" class="headerlink" title="4. Makefile"></a><font size=3>4. <code>Makefile</code></font></h2><details class="folding-tag" blue><summary> 点击查看详情 </summary>
              <div class='content'>
              <figure class="highlight makefile"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">##============================================================================#</span></span><br><span class="line"><span class="comment"># Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"># File name  : Makefile</span></span><br><span class="line"><span class="comment"># Author     : qidaink</span></span><br><span class="line"><span class="comment"># Date       : 2022-08-28</span></span><br><span class="line"><span class="comment"># Version    : </span></span><br><span class="line"><span class="comment"># Description: 驱动模块编译Makefile</span></span><br><span class="line"><span class="comment"># Others     : </span></span><br><span class="line"><span class="comment"># Log        : </span></span><br><span class="line"><span class="comment">##============================================================================#</span></span><br><span class="line"><span class="comment">##</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># 模块名和模块测试APP名称</span></span><br><span class="line">MODULE_NAME             := hello</span><br><span class="line">MODULE_DEVICE_NAME      := <span class="variable">$(MODULE_NAME)</span>_device</span><br><span class="line">MODULE_DRIVER_NAME      := <span class="variable">$(MODULE_NAME)</span>_driver</span><br><span class="line">APP_NAME                := <span class="variable">$(MODULE_NAME)</span>_app</span><br><span class="line"></span><br><span class="line">DEVICE_TREE_NAME        := exynos4412-fs4412.dts</span><br><span class="line"><span class="comment"># NFS 共享目录</span></span><br><span class="line">ROOTFS                  ?= /home/hk/4nfs/rootfs</span><br><span class="line">MODULE_DIR              ?= <span class="variable">$(ROOTFS)</span>/01myDrivers</span><br><span class="line"></span><br><span class="line"><span class="keyword">ifeq</span> (<span class="variable">$(KERNELRELEASE)</span>,)</span><br><span class="line"></span><br><span class="line"><span class="comment"># 选择可执行文件运行的平台</span></span><br><span class="line"><span class="keyword">ifeq</span> (<span class="variable">$(ARCH)</span>, arm)</span><br><span class="line">KERNELDIR               ?= /home/hk/5linux/linux-3.14</span><br><span class="line">GCC_TOOL                ?= arm-none-linux-gnueabi-gcc</span><br><span class="line"><span class="keyword">else</span></span><br><span class="line">KERNELDIR               ?= /lib/modules/<span class="variable">$(<span class="built_in">shell</span> uname -r)</span>/build</span><br><span class="line">GCC_TOOL                ?= gcc</span><br><span class="line"><span class="keyword">endif</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">PWD                     := <span class="variable">$(<span class="built_in">shell</span> pwd)</span></span><br><span class="line">DEVICE_TREE_DIR         ?= <span class="variable">$(KERNELDIR)</span>/arch/arm/boot/dts/</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment"># 编译模块和测试程序</span></span><br><span class="line"><span class="section">modules:</span></span><br><span class="line">	<span class="variable">$(MAKE)</span> -C <span class="variable">$(KERNELDIR)</span> M=<span class="variable">$(PWD)</span> modules</span><br><span class="line">	<span class="variable">$(GCC_TOOL)</span> <span class="variable">$(APP_NAME)</span>.c -Wall -o <span class="variable">$(APP_NAME)</span></span><br><span class="line"></span><br><span class="line"><span class="section">modules_install:</span></span><br><span class="line">	<span class="variable">$(MAKE)</span> -C <span class="variable">$(KERNELDIR)</span> M=<span class="variable">$(PWD)</span> modules INSTALL_MOD_PATH=<span class="variable">$(ROOTFS)</span> modules_install</span><br><span class="line"></span><br><span class="line"><span class="comment"># 拷贝相关文件到nfs共享目录</span></span><br><span class="line"><span class="section">copy:</span></span><br><span class="line">	sudo cp <span class="variable">$(MODULE_DEVICE_NAME)</span>.ko <span class="variable">$(MODULE_DIR)</span></span><br><span class="line">	sudo cp <span class="variable">$(MODULE_DRIVER_NAME)</span>.ko <span class="variable">$(MODULE_DIR)</span></span><br><span class="line">	sudo cp <span class="variable">$(APP_NAME)</span> <span class="variable">$(MODULE_DIR)</span></span><br><span class="line"></span><br><span class="line"><span class="meta"><span class="keyword">.PHONY</span>: clean</span></span><br><span class="line"><span class="section">clean:</span></span><br><span class="line">	rm -rf  *.o  *.ko  .*.cmd  *.mod.*  modules.order  Module.symvers   .tmp_versions .cache.mk <span class="variable">$(APP_NAME)</span></span><br><span class="line"></span><br><span class="line"><span class="section">help:</span></span><br><span class="line">	@echo <span class="string">&quot;\033[1;32m================================ Help ================================\033[0m&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;Ubuntu may need to add sudo:&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;insmod &lt;module_name&gt;.ko   # Load module&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;rmmod &lt;module_name&gt;       # Uninstall the module&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;dmesg -C                  # Clear the kernel print information&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;lsmod                     # Check the kernel modules that have been inserted&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;dmesg                     # View information printed by the kernel&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;file &lt;module_name&gt;.ko     # View \&quot;.Ko\&quot; file information&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;make ARCH=arm             # arm platform&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;\033[1;32m======================================================================\033[0m&quot;</span></span><br><span class="line"></span><br><span class="line"><span class="section">print:</span></span><br><span class="line">	@echo <span class="string">&quot;DEVICE_TREE_DIR = <span class="variable">$(DEVICE_TREE_DIR)</span>&quot;</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">else</span></span><br><span class="line">CONFIG_MODULE_SIG=n</span><br><span class="line">obj-m                   += <span class="variable">$(MODULE_DEVICE_NAME)</span>.o</span><br><span class="line">obj-m                   += <span class="variable">$(MODULE_DRIVER_NAME)</span>.o</span><br><span class="line"><span class="keyword">endif</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
              </div>
            </details>

<h1 id="三、ID匹配框架"><a href="#三、ID匹配框架" class="headerlink" title="三、ID匹配框架"></a><font size=3>三、<code>ID</code>匹配框架</font></h1><h2 id="1-hello-app-c-1"><a href="#1-hello-app-c-1" class="headerlink" title="1. hello_app.c"></a><font size=3>1. <code>hello_app.c</code></font></h2><details class="folding-tag" blue><summary> 点击查看详情 </summary>
              <div class='content'>
              <figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** =====================================================</span></span><br><span class="line"><span class="comment"> * Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"> * File name  : hello_app.c</span></span><br><span class="line"><span class="comment"> * Author     : qidaink</span></span><br><span class="line"><span class="comment"> * Date       : 2022-08-29</span></span><br><span class="line"><span class="comment"> * Version    : </span></span><br><span class="line"><span class="comment"> * Description: platform总线驱动 —— ID匹配基础框架测试APP</span></span><br><span class="line"><span class="comment"> * Others     : </span></span><br><span class="line"><span class="comment"> * Log        : </span></span><br><span class="line"><span class="comment"> * ======================================================</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdio.h&gt;</span>     <span class="comment">/* printf */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/types.h&gt;</span> <span class="comment">/* open */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/stat.h&gt;</span>  <span class="comment">/* open */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;fcntl.h&gt;</span>     <span class="comment">/* open */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;unistd.h&gt;</span>    <span class="comment">/* close sleep */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/ioctl.h&gt;</span> <span class="comment">/* ioctl */</span></span></span><br><span class="line"></span><br><span class="line"><span class="type">int</span> <span class="title function_">main</span><span class="params">(<span class="type">int</span> argc, <span class="type">char</span> *argv[])</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 0.相关变量定义 */</span></span><br><span class="line">    <span class="type">int</span> fd = <span class="number">-1</span>;     <span class="comment">/* 文件描述符 */</span></span><br><span class="line">    <span class="comment">/* 1.判断参数个数是否合法 */</span></span><br><span class="line">    <span class="comment">/* 1.1判断参数数量 */</span></span><br><span class="line">    <span class="keyword">if</span> (argc &lt; <span class="number">2</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">&quot;\nusage:\n&quot;</span>);</span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">&quot;%s /dev/dev_name\n&quot;</span>, argv[<span class="number">0</span>]);</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">/* 2.打开字符设备 */</span></span><br><span class="line">    <span class="keyword">if</span> ((fd = open(argv[<span class="number">1</span>], O_RDWR)) &lt; <span class="number">0</span>) <span class="comment">/* 默认是阻塞的 */</span></span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">&quot;open %s failed!\n&quot;</span>, argv[<span class="number">1</span>]);</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 4.关闭字符设备 */</span></span><br><span class="line">    close(fd);</span><br><span class="line">    fd = <span class="number">-1</span>;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
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            </details>

<h2 id="2-hello-device-c-1"><a href="#2-hello-device-c-1" class="headerlink" title="2. hello_device.c"></a><font size=3>2. <code>hello_device.c</code></font></h2><details class="folding-tag" blue><summary> 点击查看详情 </summary>
              <div class='content'>
              <figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** =====================================================</span></span><br><span class="line"><span class="comment"> * Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"> * File name  : hello_device.c</span></span><br><span class="line"><span class="comment"> * Author     : qidaink</span></span><br><span class="line"><span class="comment"> * Date       : 2022-08-29</span></span><br><span class="line"><span class="comment"> * Version    :</span></span><br><span class="line"><span class="comment"> * Description: platform总线驱动设备程序 —— ID匹配基础框架</span></span><br><span class="line"><span class="comment"> * Others     :</span></span><br><span class="line"><span class="comment"> * Log        :</span></span><br><span class="line"><span class="comment"> * ======================================================</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="comment">/** 头文件 */</span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/module.h&gt;</span>           <span class="comment">/* MODULE_LICENSE */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/kernel.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/init.h&gt;</span>             <span class="comment">/* module_init module_exit */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/platform_device.h&gt;</span></span></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 宏定义 */</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> MODULE_NAME <span class="string">&quot;hello_dev&quot;</span> <span class="comment">/* 模块名称 */</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 平台总线相关 */</span></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @Function   : hello_device_release</span></span><br><span class="line"><span class="comment"> * @brief      : 删除设备</span></span><br><span class="line"><span class="comment"> * @param pdev : struct device * 类型</span></span><br><span class="line"><span class="comment"> * @return     : none</span></span><br><span class="line"><span class="comment"> * @Description: 函数名赋值给 struct platform_device 结构体的 .dev.release 成员</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="type">void</span> <span class="title function_">hello_device_release</span><span class="params">(<span class="keyword">struct</span> device *pdev)</span></span><br><span class="line">&#123;</span><br><span class="line">    printk(<span class="string">&quot;[INFO]hello_device_release is called!\n&quot;</span>);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/** </span></span><br><span class="line"><span class="comment"> *  定义资源数组(注意不能有重叠区域，否则会报错：failed to claim resource 2/3/4/5)</span></span><br><span class="line"><span class="comment"> *  结构体变量名赋值给 struct platform_device 结构体的 .resource 成员</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">resource</span> <span class="title">hello_device_res</span>[] =</span> &#123;</span><br><span class="line">    [<span class="number">0</span>] = &#123;.start = <span class="number">0x1000</span>, .end = <span class="number">0x1003</span>, .name = <span class="string">&quot;reg1&quot;</span>, .flags = IORESOURCE_MEM&#125;,</span><br><span class="line">    [<span class="number">1</span>] = &#123;.start = <span class="number">0x2000</span>, .end = <span class="number">0x2003</span>, .name = <span class="string">&quot;reg2&quot;</span>, .flags = IORESOURCE_MEM&#125;,</span><br><span class="line">    [<span class="number">2</span>] = &#123;.start =     <span class="number">10</span>, .end =     <span class="number">10</span>, .name = <span class="string">&quot;irq1&quot;</span>, .flags = IORESOURCE_IRQ&#125;,</span><br><span class="line">    [<span class="number">3</span>] = &#123;.start = <span class="number">0x3000</span>, .end = <span class="number">0x3003</span>, .name = <span class="string">&quot;reg3&quot;</span>, .flags = IORESOURCE_MEM&#125;,</span><br><span class="line">    [<span class="number">4</span>] = &#123;.start =    <span class="number">100</span>, .end =    <span class="number">100</span>, .name = <span class="string">&quot;irq2&quot;</span>, .flags = IORESOURCE_IRQ&#125;,</span><br><span class="line">    [<span class="number">5</span>] = &#123;.start =     <span class="number">62</span>, .end =     <span class="number">62</span>, .name = <span class="string">&quot;irq3&quot;</span>, .flags = IORESOURCE_IRQ&#125;,</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">/** </span></span><br><span class="line"><span class="comment"> *  定义ID匹配数组 </span></span><br><span class="line"><span class="comment"> *  结构体变量名赋值给 struct platform_device 结构体的 .id_entry 成员</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">platform_device_id</span> <span class="title">hello_id</span> =</span> &#123;</span><br><span class="line">	.name = MODULE_NAME,                 <span class="comment">/* 这里要与 struct platform_device 结构体中 name 成员相同 */</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">/** 定义platform平台总线 */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">platform_device</span> <span class="title">hello_device</span> =</span> &#123;</span><br><span class="line">    .name = MODULE_NAME,                 <span class="comment">/* 必须初始化 name 成员 */</span></span><br><span class="line">    .dev.release = hello_device_release, <span class="comment">/* 删除设备 */</span></span><br><span class="line">    .resource = hello_device_res,        <span class="comment">/* 资源数组 */</span></span><br><span class="line">    .num_resources = ARRAY_SIZE(hello_device_res), <span class="comment">/* 资源数组元素个数 */</span></span><br><span class="line">    .id_entry = &amp;hello_id,</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 整个模块相关 */</span></span><br><span class="line"><span class="comment">/* 驱动入口函数 */</span></span><br><span class="line"><span class="type">int</span> __init <span class="title function_">hello_device_init</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 1.注册：把指定设备添加到内核中平台总线的设备列表，等待匹配，匹配成功则会调用驱动(driver)中 probe */</span></span><br><span class="line">    platform_device_register(&amp;hello_device);</span><br><span class="line">    <span class="comment">/* 2.打印加载模块的提示信息 */</span></span><br><span class="line">    printk(<span class="string">&quot;[INFO]This module [%s](device) is loaded!\n&quot;</span>, MODULE_NAME);</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 驱动出口函数 */</span></span><br><span class="line"><span class="type">void</span> __exit <span class="title function_">hello_device_exit</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 1.注销：把指定设备从设备列表中删除 */</span></span><br><span class="line">    platform_device_unregister(&amp;hello_device);</span><br><span class="line">    <span class="comment">/* 2.打印卸载模块的提示信息 */</span></span><br><span class="line">    printk(<span class="string">&quot;[INFO]This module [%s](device) is exited!\n&quot;</span>, MODULE_NAME);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 将上面两个函数指定为驱动的入口和出口函数 */</span></span><br><span class="line">module_init(hello_device_init);</span><br><span class="line">module_exit(hello_device_exit);</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 模块信息(通过 modinfo module_name 查看) */</span></span><br><span class="line">MODULE_LICENSE(<span class="string">&quot;GPL&quot;</span>);                        <span class="comment">/* 源码的许可证协议 */</span></span><br><span class="line">MODULE_AUTHOR(<span class="string">&quot;qidaink&quot;</span>);                     <span class="comment">/* 字符串常量内容为模块作者说明 */</span></span><br><span class="line">MODULE_DESCRIPTION(<span class="string">&quot;Description&quot;</span>);            <span class="comment">/* 字符串常量内容为模块功能说明 */</span></span><br><span class="line">MODULE_ALIAS(<span class="string">&quot;module&#x27;s other name&quot;</span>);          <span class="comment">/* 字符串常量内容为模块别名 */</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
              </div>
            </details>

<h2 id="3-hello-driver-c-1"><a href="#3-hello-driver-c-1" class="headerlink" title="3. hello_driver.c"></a><font size=3>3. <code>hello_driver.c</code></font></h2><details class="folding-tag" blue><summary> 点击查看详情 </summary>
              <div class='content'>
              <figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** =====================================================</span></span><br><span class="line"><span class="comment"> * Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"> * File name  : hello_driver.c</span></span><br><span class="line"><span class="comment"> * Author     : qidaink</span></span><br><span class="line"><span class="comment"> * Date       : 2022-08-29</span></span><br><span class="line"><span class="comment"> * Version    :</span></span><br><span class="line"><span class="comment"> * Description: platform总线驱动驱动程序 —— ID匹配基础框架</span></span><br><span class="line"><span class="comment"> * Others     :</span></span><br><span class="line"><span class="comment"> * Log        :</span></span><br><span class="line"><span class="comment"> * ======================================================</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="comment">/** 头文件 */</span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/module.h&gt;</span> <span class="comment">/* MODULE_LICENSE */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/kernel.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/init.h&gt;</span>            <span class="comment">/* module_init module_exit */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/platform_device.h&gt;</span> <span class="comment">/* platform_get_resource */</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 宏定义 */</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> MODULE_NAME <span class="string">&quot;hello_drv&quot;</span> <span class="comment">/* 模块名称 */</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 平台驱动相关 */</span></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @Function       : hello_driver_probe</span></span><br><span class="line"><span class="comment"> * @brief          : 设备和驱动匹配成功之后的调用函数</span></span><br><span class="line"><span class="comment"> * @param p_pltdev : struct device * 类型</span></span><br><span class="line"><span class="comment"> * @return         : int 类型</span></span><br><span class="line"><span class="comment"> * @Description    : 函数名赋值给 struct platform_driver 结构体的 .probe 成员</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">hello_driver_probe</span><span class="params">(<span class="keyword">struct</span> platform_device *p_pltdev)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 0.相关变量定义 */</span></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">resource</span> *<span class="title">pres</span> =</span> <span class="literal">NULL</span>; <span class="comment">/* 暂存资源 */</span></span><br><span class="line">    <span class="type">int</span> i = <span class="number">0</span>;</span><br><span class="line">    <span class="comment">/* 1.获取设备寄存器资源 */</span></span><br><span class="line">    printk(<span class="string">&quot;=====================================================\n&quot;</span>);</span><br><span class="line">    <span class="keyword">for</span>(i = <span class="number">0</span>; i &lt; <span class="number">3</span>; i++)</span><br><span class="line">    &#123;</span><br><span class="line">        pres = platform_get_resource(p_pltdev, IORESOURCE_MEM, i);</span><br><span class="line">        printk(<span class="string">&quot;IORESOURCE_MEM[%d]start=0x%x,end=0x%x,name=%s\n&quot;</span>, i,(<span class="type">unsigned</span> <span class="type">int</span>)pres-&gt;start, (<span class="type">unsigned</span> <span class="type">int</span>)pres-&gt;end, pres-&gt;name);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">/* 2.获取中断号资源 */</span></span><br><span class="line">    <span class="keyword">for</span>(i = <span class="number">0</span>; i &lt; <span class="number">3</span>; i++)</span><br><span class="line">    &#123;</span><br><span class="line">        pres = platform_get_resource(p_pltdev, IORESOURCE_IRQ, i);</span><br><span class="line">        printk(<span class="string">&quot;IORESOURCE_IRQ[%d]start=0x%x,end=0x%x,name=%s\n&quot;</span>, i,(<span class="type">int</span>)pres-&gt;start, (<span class="type">int</span>)pres-&gt;end, pres-&gt;name);</span><br><span class="line">    &#125;</span><br><span class="line">    printk(<span class="string">&quot;=====================================================\n&quot;</span>);</span><br><span class="line">    <span class="comment">/* 打印提示信息 */</span></span><br><span class="line">    printk(<span class="string">&quot;[INFO]hello_driver_probe is called!\n&quot;</span>);</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @Function       : hello_driver_remove</span></span><br><span class="line"><span class="comment"> * @brief          : 卸载设备</span></span><br><span class="line"><span class="comment"> * @param p_pltdev : struct platform_device * 类型</span></span><br><span class="line"><span class="comment"> * @return         : int 类型</span></span><br><span class="line"><span class="comment"> * @Description    : 函数名赋值给 struct platform_driver 结构体的 .remove 成员</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">hello_driver_remove</span><span class="params">(<span class="keyword">struct</span> platform_device *p_pltdev)</span></span><br><span class="line">&#123;</span><br><span class="line">    printk(<span class="string">&quot;[INFO]hello_driver_remove is called!\n&quot;</span>);</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">/** </span></span><br><span class="line"><span class="comment"> *  定义匹配ID数组 </span></span><br><span class="line"><span class="comment"> *  与数组中含有的名称相同的设备都可以匹配到该驱动</span></span><br><span class="line"><span class="comment"> *  结构体变量名赋值给 struct platform_driver 结构体的 .id_table 成员</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">platform_device_id</span> <span class="title">hello_driver_ids</span>[] =</span> </span><br><span class="line">&#123;</span><br><span class="line">	[<span class="number">0</span>] = &#123;.name = <span class="string">&quot;hello_dev&quot;</span>&#125;,</span><br><span class="line">	[<span class="number">1</span>] = &#123;.name = <span class="string">&quot;a&quot;</span>&#125;,</span><br><span class="line">	[<span class="number">2</span>] = &#123;&#125;                   <span class="comment">/* means ending */</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">/** 定义platform平台驱动 */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">platform_driver</span> <span class="title">hello_driver</span> =</span> &#123;</span><br><span class="line">    .driver = &#123;</span><br><span class="line">        .name = MODULE_NAME,       <span class="comment">/* 必须初始化 name 成员 */</span></span><br><span class="line">    &#125;,</span><br><span class="line">    .probe = hello_driver_probe,   <span class="comment">/* 设备和驱动匹配成功之后的调用函数 */</span></span><br><span class="line">    .remove = hello_driver_remove, <span class="comment">/* 卸载设备 */</span></span><br><span class="line">    .id_table = hello_driver_ids,  <span class="comment">/* 可匹配的设备ID数组 */</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 整个模块相关 */</span></span><br><span class="line"><span class="comment">/* 驱动入口函数 */</span></span><br><span class="line"><span class="type">int</span> __init <span class="title function_">hello_driver_init</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 1.注册平台设备驱动 */</span></span><br><span class="line">    platform_driver_register(&amp;hello_driver);</span><br><span class="line">    <span class="comment">/* 2.打印加载模块的提示信息 */</span></span><br><span class="line">    printk(<span class="string">&quot;[INFO]This module [%s](driver) is loaded!\n&quot;</span>, MODULE_NAME);</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 驱动出口函数 */</span></span><br><span class="line"><span class="type">void</span> __exit <span class="title function_">hello_driver_exit</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 1.注销平台设备驱动 */</span></span><br><span class="line">    platform_driver_unregister(&amp;hello_driver);</span><br><span class="line">    <span class="comment">/* 2.打印卸载模块的提示信息 */</span></span><br><span class="line">    printk(<span class="string">&quot;[INFO]This module [%s](driver) is exited!\n&quot;</span>, MODULE_NAME);</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">/* 将上面两个函数指定为驱动的入口和出口函数 */</span></span><br><span class="line">module_init(hello_driver_init);</span><br><span class="line">module_exit(hello_driver_exit);</span><br><span class="line"><span class="comment">/* 模块信息(通过 modinfo module_name 查看) */</span></span><br><span class="line">MODULE_LICENSE(<span class="string">&quot;GPL&quot;</span>);                        <span class="comment">/* 源码的许可证协议 */</span></span><br><span class="line">MODULE_AUTHOR(<span class="string">&quot;qidaink &lt;2038035593@qq.com&gt;&quot;</span>); <span class="comment">/* 字符串常量内容为模块作者说明 */</span></span><br><span class="line">MODULE_DESCRIPTION(<span class="string">&quot;Description&quot;</span>);            <span class="comment">/* 字符串常量内容为模块功能说明 */</span></span><br><span class="line">MODULE_ALIAS(<span class="string">&quot;module&#x27;s other name&quot;</span>);          <span class="comment">/* 字符串常量内容为模块别名 */</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
              </div>
            </details>

<h2 id="4-Makefile-1"><a href="#4-Makefile-1" class="headerlink" title="4. Makefile"></a><font size=3>4. <code>Makefile</code></font></h2><details class="folding-tag" blue><summary> 点击查看详情 </summary>
              <div class='content'>
              <figure class="highlight makefile"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">##============================================================================#</span></span><br><span class="line"><span class="comment"># Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"># File name  : Makefile</span></span><br><span class="line"><span class="comment"># Author     : qidaink</span></span><br><span class="line"><span class="comment"># Date       : 2022-08-28</span></span><br><span class="line"><span class="comment"># Version    : </span></span><br><span class="line"><span class="comment"># Description: 驱动模块编译Makefile</span></span><br><span class="line"><span class="comment"># Others     : </span></span><br><span class="line"><span class="comment"># Log        : </span></span><br><span class="line"><span class="comment">##============================================================================#</span></span><br><span class="line"><span class="comment">##</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># 模块名和模块测试APP名称</span></span><br><span class="line">MODULE_NAME             := hello</span><br><span class="line">MODULE_DEVICE_NAME      := <span class="variable">$(MODULE_NAME)</span>_device</span><br><span class="line">MODULE_DRIVER_NAME      := <span class="variable">$(MODULE_NAME)</span>_driver</span><br><span class="line">APP_NAME                := <span class="variable">$(MODULE_NAME)</span>_app</span><br><span class="line"></span><br><span class="line">DEVICE_TREE_NAME        := exynos4412-fs4412.dts</span><br><span class="line"><span class="comment"># NFS 共享目录</span></span><br><span class="line">ROOTFS                  ?= /home/hk/4nfs/rootfs</span><br><span class="line">MODULE_DIR              ?= <span class="variable">$(ROOTFS)</span>/01myDrivers</span><br><span class="line"></span><br><span class="line"><span class="keyword">ifeq</span> (<span class="variable">$(KERNELRELEASE)</span>,)</span><br><span class="line"></span><br><span class="line"><span class="comment"># 选择可执行文件运行的平台</span></span><br><span class="line"><span class="keyword">ifeq</span> (<span class="variable">$(ARCH)</span>, arm)</span><br><span class="line">KERNELDIR               ?= /home/hk/5linux/linux-3.14</span><br><span class="line">GCC_TOOL                ?= arm-none-linux-gnueabi-gcc</span><br><span class="line"><span class="keyword">else</span></span><br><span class="line">KERNELDIR               ?= /lib/modules/<span class="variable">$(<span class="built_in">shell</span> uname -r)</span>/build</span><br><span class="line">GCC_TOOL                ?= gcc</span><br><span class="line"><span class="keyword">endif</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">PWD                     := <span class="variable">$(<span class="built_in">shell</span> pwd)</span></span><br><span class="line">DEVICE_TREE_DIR         ?= <span class="variable">$(KERNELDIR)</span>/arch/arm/boot/dts/</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment"># 编译模块和测试程序</span></span><br><span class="line"><span class="section">modules:</span></span><br><span class="line">	<span class="variable">$(MAKE)</span> -C <span class="variable">$(KERNELDIR)</span> M=<span class="variable">$(PWD)</span> modules</span><br><span class="line">	<span class="variable">$(GCC_TOOL)</span> <span class="variable">$(APP_NAME)</span>.c -Wall -o <span class="variable">$(APP_NAME)</span></span><br><span class="line"></span><br><span class="line"><span class="section">modules_install:</span></span><br><span class="line">	<span class="variable">$(MAKE)</span> -C <span class="variable">$(KERNELDIR)</span> M=<span class="variable">$(PWD)</span> modules INSTALL_MOD_PATH=<span class="variable">$(ROOTFS)</span> modules_install</span><br><span class="line"></span><br><span class="line"><span class="comment"># 拷贝相关文件到nfs共享目录</span></span><br><span class="line"><span class="section">copy:</span></span><br><span class="line">	sudo cp <span class="variable">$(MODULE_DEVICE_NAME)</span>.ko <span class="variable">$(MODULE_DIR)</span></span><br><span class="line">	sudo cp <span class="variable">$(MODULE_DRIVER_NAME)</span>.ko <span class="variable">$(MODULE_DIR)</span></span><br><span class="line">	sudo cp <span class="variable">$(APP_NAME)</span> <span class="variable">$(MODULE_DIR)</span></span><br><span class="line"></span><br><span class="line"><span class="meta"><span class="keyword">.PHONY</span>: clean</span></span><br><span class="line"><span class="section">clean:</span></span><br><span class="line">	rm -rf  *.o  *.ko  .*.cmd  *.mod.*  modules.order  Module.symvers   .tmp_versions .cache.mk <span class="variable">$(APP_NAME)</span></span><br><span class="line"></span><br><span class="line"><span class="section">help:</span></span><br><span class="line">	@echo <span class="string">&quot;\033[1;32m================================ Help ================================\033[0m&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;Ubuntu may need to add sudo:&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;insmod &lt;module_name&gt;.ko   # Load module&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;rmmod &lt;module_name&gt;       # Uninstall the module&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;dmesg -C                  # Clear the kernel print information&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;lsmod                     # Check the kernel modules that have been inserted&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;dmesg                     # View information printed by the kernel&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;file &lt;module_name&gt;.ko     # View \&quot;.Ko\&quot; file information&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;make ARCH=arm             # arm platform&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;\033[1;32m======================================================================\033[0m&quot;</span></span><br><span class="line"></span><br><span class="line"><span class="section">print:</span></span><br><span class="line">	@echo <span class="string">&quot;DEVICE_TREE_DIR = <span class="variable">$(DEVICE_TREE_DIR)</span>&quot;</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">else</span></span><br><span class="line">CONFIG_MODULE_SIG=n</span><br><span class="line">obj-m                   += <span class="variable">$(MODULE_DEVICE_NAME)</span>.o</span><br><span class="line">obj-m                   += <span class="variable">$(MODULE_DRIVER_NAME)</span>.o</span><br><span class="line"><span class="keyword">endif</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
              </div>
            </details>

<h1 id="四、设备树匹配框架"><a href="#四、设备树匹配框架" class="headerlink" title="四、设备树匹配框架"></a><font size=3>四、设备树匹配框架</font></h1><h2 id="1-hello-app-c-2"><a href="#1-hello-app-c-2" class="headerlink" title="1. hello_app.c"></a><font size=3>1. <code>hello_app.c</code></font></h2><details class="folding-tag" blue><summary> 点击查看详情 </summary>
              <div class='content'>
              <figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** =====================================================</span></span><br><span class="line"><span class="comment"> * Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"> * File name  : hello_app.c</span></span><br><span class="line"><span class="comment"> * Author     : qidaink</span></span><br><span class="line"><span class="comment"> * Date       : 2022-08-29</span></span><br><span class="line"><span class="comment"> * Version    : </span></span><br><span class="line"><span class="comment"> * Description: platform总线驱动 —— 设备树匹配基础框架测试APP</span></span><br><span class="line"><span class="comment"> * Others     : </span></span><br><span class="line"><span class="comment"> * Log        : </span></span><br><span class="line"><span class="comment"> * ======================================================</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdio.h&gt;</span>     <span class="comment">/* printf */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/types.h&gt;</span> <span class="comment">/* open */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/stat.h&gt;</span>  <span class="comment">/* open */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;fcntl.h&gt;</span>     <span class="comment">/* open */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;unistd.h&gt;</span>    <span class="comment">/* close sleep */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/ioctl.h&gt;</span> <span class="comment">/* ioctl */</span></span></span><br><span class="line"></span><br><span class="line"><span class="type">int</span> <span class="title function_">main</span><span class="params">(<span class="type">int</span> argc, <span class="type">char</span> *argv[])</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 0.相关变量定义 */</span></span><br><span class="line">    <span class="type">int</span> fd = <span class="number">-1</span>;     <span class="comment">/* 文件描述符 */</span></span><br><span class="line">    <span class="comment">/* 1.判断参数个数是否合法 */</span></span><br><span class="line">    <span class="comment">/* 1.1判断参数数量 */</span></span><br><span class="line">    <span class="keyword">if</span> (argc &lt; <span class="number">2</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">&quot;\nusage:\n&quot;</span>);</span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">&quot;%s /dev/dev_name\n&quot;</span>, argv[<span class="number">0</span>]);</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">/* 2.打开字符设备 */</span></span><br><span class="line">    <span class="keyword">if</span> ((fd = open(argv[<span class="number">1</span>], O_RDWR)) &lt; <span class="number">0</span>) <span class="comment">/* 默认是阻塞的 */</span></span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">&quot;open %s failed!\n&quot;</span>, argv[<span class="number">1</span>]);</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 4.关闭字符设备 */</span></span><br><span class="line">    close(fd);</span><br><span class="line">    fd = <span class="number">-1</span>;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>
              </div>
            </details>

<h2 id="2-hello-device-c-2"><a href="#2-hello-device-c-2" class="headerlink" title="2.hello_device.c"></a><font size=3>2.<code>hello_device.c</code></font></h2><p>设备数匹配的话，不需要设备程序，在设备树中添加设备信息即可，在加载驱动模块的时候，会自动与设备树中的设备进行匹配。</p>
<h2 id="3-hello-driver-c-2"><a href="#3-hello-driver-c-2" class="headerlink" title="3. hello_driver.c"></a><font size=3>3. <code>hello_driver.c</code></font></h2><details class="folding-tag" blue><summary> 点击查看详情 </summary>
              <div class='content'>
              <figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** =====================================================</span></span><br><span class="line"><span class="comment"> * Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"> * File name  : hello_driver.c</span></span><br><span class="line"><span class="comment"> * Author     : qidaink</span></span><br><span class="line"><span class="comment"> * Date       : 2022-08-29</span></span><br><span class="line"><span class="comment"> * Version    :</span></span><br><span class="line"><span class="comment"> * Description: platform总线驱动驱动程序 —— 设备树匹配基础框架</span></span><br><span class="line"><span class="comment"> * Others     :</span></span><br><span class="line"><span class="comment"> * Log        :</span></span><br><span class="line"><span class="comment"> * ======================================================</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="comment">/** 头文件 */</span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/module.h&gt;</span> <span class="comment">/* MODULE_LICENSE */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/kernel.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/init.h&gt;</span>            <span class="comment">/* module_init module_exit */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/platform_device.h&gt;</span> <span class="comment">/* platform_get_resource */</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/of.h&gt;</span></span></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 宏定义 */</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> MODULE_NAME <span class="string">&quot;hello_drv&quot;</span> <span class="comment">/* 模块名称 */</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 平台驱动相关 */</span></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @Function       : hello_driver_probe</span></span><br><span class="line"><span class="comment"> * @brief          : 设备和驱动匹配成功之后的调用函数</span></span><br><span class="line"><span class="comment"> * @param p_pltdev : struct device * 类型</span></span><br><span class="line"><span class="comment"> * @return         : int 类型</span></span><br><span class="line"><span class="comment"> * @Description    : 函数名赋值给 struct platform_driver 结构体的 .probe 成员</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">hello_driver_probe</span><span class="params">(<span class="keyword">struct</span> platform_device *p_pltdev)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 0.相关变量定义 */</span></span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">device_node</span> *<span class="title">pnode</span> =</span> <span class="literal">NULL</span>; <span class="comment">/* 存储设备树节点 */</span></span><br><span class="line">    <span class="type">const</span> <span class="type">char</span> *str = <span class="literal">NULL</span>;</span><br><span class="line">    <span class="comment">/* 1.获取设备树节点 */</span></span><br><span class="line">    pnode = p_pltdev-&gt;dev.of_node;</span><br><span class="line">    <span class="comment">/* 2.获取设备树reg数据 */</span></span><br><span class="line">    printk(<span class="string">&quot;=====================================================\n&quot;</span>);</span><br><span class="line">    <span class="keyword">if</span>(of_property_read_string(pnode, <span class="string">&quot;my-name&quot;</span>, &amp;str) &lt; <span class="number">0</span>)</span><br><span class="line">        printk(<span class="string">&quot;of_property_read_string failed!\n&quot;</span>);</span><br><span class="line">    <span class="keyword">else</span></span><br><span class="line">        printk(<span class="string">&quot;name=%s\n&quot;</span>, str);</span><br><span class="line">    printk(<span class="string">&quot;=====================================================\n&quot;</span>);</span><br><span class="line">    <span class="comment">/* 打印提示信息 */</span></span><br><span class="line">    printk(<span class="string">&quot;[INFO]hello_driver_probe is called!\n&quot;</span>);</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * @Function       : hello_driver_remove</span></span><br><span class="line"><span class="comment"> * @brief          : 卸载设备</span></span><br><span class="line"><span class="comment"> * @param p_pltdev : struct platform_device * 类型</span></span><br><span class="line"><span class="comment"> * @return         : int 类型</span></span><br><span class="line"><span class="comment"> * @Description    : 函数名赋值给 struct platform_driver 结构体的 .remove 成员</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">hello_driver_remove</span><span class="params">(<span class="keyword">struct</span> platform_device *p_pltdev)</span></span><br><span class="line">&#123;</span><br><span class="line">    printk(<span class="string">&quot;[INFO]hello_driver_remove is called!\n&quot;</span>);</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/** </span></span><br><span class="line"><span class="comment"> *  定义匹配设备树数组</span></span><br><span class="line"><span class="comment"> *  与数组中含有的名称相同的设备都可以匹配到该驱动</span></span><br><span class="line"><span class="comment"> *  结构体变量名赋值给 struct platform_driver 结构体的 ..driver.of_match_table 成员</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">of_device_id</span> <span class="title">hello_driver_dt_ids</span>[] =</span> &#123;</span><br><span class="line">    [<span class="number">0</span>] = &#123;.compatible = <span class="string">&quot;fs4412,hello-dt&quot;</span>&#125;,  <span class="comment">/* 设备树中 compatible 的名称 */</span></span><br><span class="line">    [<span class="number">1</span>] = &#123;.compatible = <span class="string">&quot;origen4412,hello-dt&quot;</span>&#125;,</span><br><span class="line">    [<span class="number">2</span>] = &#123;&#125;                               <span class="comment">/* means ending */</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">/** 定义platform平台驱动 */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">platform_driver</span> <span class="title">hello_driver</span> =</span> &#123;</span><br><span class="line">    .driver = &#123;</span><br><span class="line">        .name = MODULE_NAME,       <span class="comment">/* 必须初始化 name 成员 */</span></span><br><span class="line">        .of_match_table = hello_driver_dt_ids,</span><br><span class="line">    &#125;,</span><br><span class="line">    .probe = hello_driver_probe,   <span class="comment">/* 设备和驱动匹配成功之后的调用函数 */</span></span><br><span class="line">    .remove = hello_driver_remove, <span class="comment">/* 卸载设备 */</span></span><br><span class="line">    <span class="comment">// .id_table = hello_driver_ids,  /* 可匹配的设备ID数组 */</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//=======================================================//</span></span><br><span class="line"><span class="comment">/** 整个模块相关 */</span></span><br><span class="line"><span class="comment">/* 驱动入口函数 */</span></span><br><span class="line"><span class="type">int</span> __init <span class="title function_">hello_driver_init</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 1.注册平台设备驱动 */</span></span><br><span class="line">    platform_driver_register(&amp;hello_driver);</span><br><span class="line">    <span class="comment">/* 2.打印加载模块的提示信息 */</span></span><br><span class="line">    printk(<span class="string">&quot;[INFO]This module [%s](driver) is loaded!\n&quot;</span>, MODULE_NAME);</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 驱动出口函数 */</span></span><br><span class="line"><span class="type">void</span> __exit <span class="title function_">hello_driver_exit</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="comment">/* 1.注销平台设备驱动 */</span></span><br><span class="line">    platform_driver_unregister(&amp;hello_driver);</span><br><span class="line">    <span class="comment">/* 2.打印卸载模块的提示信息 */</span></span><br><span class="line">    printk(<span class="string">&quot;[INFO]This module [%s](driver) is exited!\n&quot;</span>, MODULE_NAME);</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">/* 将上面两个函数指定为驱动的入口和出口函数 */</span></span><br><span class="line">module_init(hello_driver_init);</span><br><span class="line">module_exit(hello_driver_exit);</span><br><span class="line"><span class="comment">/* 模块信息(通过 modinfo module_name 查看) */</span></span><br><span class="line">MODULE_LICENSE(<span class="string">&quot;GPL&quot;</span>);                        <span class="comment">/* 源码的许可证协议 */</span></span><br><span class="line">MODULE_AUTHOR(<span class="string">&quot;qidaink &lt;2038035593@qq.com&gt;&quot;</span>); <span class="comment">/* 字符串常量内容为模块作者说明 */</span></span><br><span class="line">MODULE_DESCRIPTION(<span class="string">&quot;Description&quot;</span>);            <span class="comment">/* 字符串常量内容为模块功能说明 */</span></span><br><span class="line">MODULE_ALIAS(<span class="string">&quot;module&#x27;s other name&quot;</span>);          <span class="comment">/* 字符串常量内容为模块别名 */</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
              </div>
            </details>

<h2 id="4-设备树文件"><a href="#4-设备树文件" class="headerlink" title="4. 设备树文件"></a><font size=3>4. 设备树文件</font></h2><p>在设备树文件根节点中添加以下内容：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">fs4412-hello-dt&#123;</span><br><span class="line">	compatible = <span class="string">&quot;fs4412,hello-dt&quot;</span>;</span><br><span class="line">	my-name = <span class="string">&quot;my-hello-dt&quot;</span>;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>

<p>我使用的是<code>fs4412</code>开发板，所以直接修改了下边这文件：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">linux3.14/arch/arm/boot/dts/exynos4412-fs4412.dts</span><br></pre></td></tr></table></figure>



<h2 id="5-Makefile"><a href="#5-Makefile" class="headerlink" title="5. Makefile"></a><font size=3>5. <code>Makefile</code></font></h2><details class="folding-tag" blue><summary> 点击查看详情 </summary>
              <div class='content'>
              <figure class="highlight makefile"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">##============================================================================#</span></span><br><span class="line"><span class="comment"># Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"># File name  : Makefile</span></span><br><span class="line"><span class="comment"># Author     : qidaink</span></span><br><span class="line"><span class="comment"># Date       : 2022-08-28</span></span><br><span class="line"><span class="comment"># Version    : </span></span><br><span class="line"><span class="comment"># Description: 驱动模块编译Makefile</span></span><br><span class="line"><span class="comment"># Others     : </span></span><br><span class="line"><span class="comment"># Log        : </span></span><br><span class="line"><span class="comment">##============================================================================#</span></span><br><span class="line"><span class="comment">##</span></span><br><span class="line"></span><br><span class="line"><span class="comment"># 模块名和模块测试APP名称</span></span><br><span class="line">MODULE_NAME             := hello</span><br><span class="line">MODULE_DRIVER_NAME      := <span class="variable">$(MODULE_NAME)</span>_driver</span><br><span class="line">APP_NAME                := <span class="variable">$(MODULE_NAME)</span>_app</span><br><span class="line"></span><br><span class="line">DEVICE_TREE_NAME        := exynos4412-fs4412.dts</span><br><span class="line"><span class="comment"># NFS 共享目录</span></span><br><span class="line">ROOTFS                  ?= /home/hk/4nfs/rootfs</span><br><span class="line">MODULE_DIR              ?= <span class="variable">$(ROOTFS)</span>/01myDrivers</span><br><span class="line"></span><br><span class="line"><span class="keyword">ifeq</span> (<span class="variable">$(KERNELRELEASE)</span>,)</span><br><span class="line"></span><br><span class="line"><span class="comment"># 选择可执行文件运行的平台</span></span><br><span class="line"><span class="keyword">ifeq</span> (<span class="variable">$(ARCH)</span>, arm)</span><br><span class="line">KERNELDIR               ?= /home/hk/5linux/linux-3.14</span><br><span class="line">GCC_TOOL                ?= arm-none-linux-gnueabi-gcc</span><br><span class="line"><span class="keyword">else</span></span><br><span class="line">KERNELDIR               ?= /lib/modules/<span class="variable">$(<span class="built_in">shell</span> uname -r)</span>/build</span><br><span class="line">GCC_TOOL                ?= gcc</span><br><span class="line"><span class="keyword">endif</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">PWD                     := <span class="variable">$(<span class="built_in">shell</span> pwd)</span></span><br><span class="line">DEVICE_TREE_DIR         ?= <span class="variable">$(KERNELDIR)</span>/arch/arm/boot/dts/</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment"># 编译模块和测试程序</span></span><br><span class="line"><span class="section">modules:</span></span><br><span class="line">	<span class="variable">$(MAKE)</span> -C <span class="variable">$(KERNELDIR)</span> M=<span class="variable">$(PWD)</span> modules</span><br><span class="line">	<span class="variable">$(GCC_TOOL)</span> <span class="variable">$(APP_NAME)</span>.c -Wall -o <span class="variable">$(APP_NAME)</span></span><br><span class="line"></span><br><span class="line"><span class="section">modules_install:</span></span><br><span class="line">	<span class="variable">$(MAKE)</span> -C <span class="variable">$(KERNELDIR)</span> M=<span class="variable">$(PWD)</span> modules INSTALL_MOD_PATH=<span class="variable">$(ROOTFS)</span> modules_install</span><br><span class="line"></span><br><span class="line"><span class="comment"># 拷贝相关文件到nfs共享目录</span></span><br><span class="line"><span class="section">copy:</span></span><br><span class="line">	sudo cp <span class="variable">$(MODULE_DRIVER_NAME)</span>.ko <span class="variable">$(MODULE_DIR)</span></span><br><span class="line">	sudo cp <span class="variable">$(APP_NAME)</span> <span class="variable">$(MODULE_DIR)</span></span><br><span class="line"></span><br><span class="line"><span class="meta"><span class="keyword">.PHONY</span>: clean</span></span><br><span class="line"><span class="section">clean:</span></span><br><span class="line">	rm -rf  *.o  *.ko  .*.cmd  *.mod.*  modules.order  Module.symvers   .tmp_versions .cache.mk <span class="variable">$(APP_NAME)</span></span><br><span class="line"></span><br><span class="line"><span class="section">help:</span></span><br><span class="line">	@echo <span class="string">&quot;\033[1;32m================================ Help ================================\033[0m&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;Ubuntu may need to add sudo:&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;insmod &lt;module_name&gt;.ko   # Load module&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;rmmod &lt;module_name&gt;       # Uninstall the module&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;dmesg -C                  # Clear the kernel print information&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;lsmod                     # Check the kernel modules that have been inserted&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;dmesg                     # View information printed by the kernel&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;file &lt;module_name&gt;.ko     # View \&quot;.Ko\&quot; file information&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;make ARCH=arm             # arm platform&quot;</span></span><br><span class="line">	@echo <span class="string">&quot;\033[1;32m======================================================================\033[0m&quot;</span></span><br><span class="line"></span><br><span class="line"><span class="section">print:</span></span><br><span class="line">	@echo <span class="string">&quot;DEVICE_TREE_DIR = <span class="variable">$(DEVICE_TREE_DIR)</span>&quot;</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">else</span></span><br><span class="line">CONFIG_MODULE_SIG=n</span><br><span class="line">obj-m                   += <span class="variable">$(MODULE_DRIVER_NAME)</span>.o</span><br><span class="line"><span class="keyword">endif</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
              </div>
            </details>

<h1 id="五、platform开发总结"><a href="#五、platform开发总结" class="headerlink" title="五、platform开发总结"></a><font size=3>五、platform开发总结</font></h1><details class="folding-tag" blue><summary> 点击查看思维导图 </summary>
              <div class='content'>
              <img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV10-%E9%A9%B1%E5%8A%A8%E5%BC%80%E5%8F%91/LV10-10-platform-02-%E4%B8%89%E7%A7%8D%E5%8C%B9%E9%85%8D%E6%96%B9%E5%BC%8F/img/01.png" alt="01" style="zoom:50%;" />
              </div>
            </details>

<h1 id="六、一个编写驱动的宏"><a href="#六、一个编写驱动的宏" class="headerlink" title="六、一个编写驱动的宏"></a><font size=3>六、一个编写驱动的宏</font></h1><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* 定义platform驱动 */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">platform_driver</span> <span class="title">xxx</span> =</span> &#123;  </span><br><span class="line">    ...</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 模块入口函数与出口函数的宏定义 */</span></span><br><span class="line">module_platform_driver(xxx);</span><br><span class="line"><span class="comment">/* module_platform_driver宏（定义在 linux/platform_device.h 文件中）最终展开后就是如下形式 */</span></span><br><span class="line"><span class="type">static</span> <span class="type">int</span> __init <span class="title function_">xxx_init</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">        <span class="keyword">return</span> platform_driver_register(&amp;xxx);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="type">static</span> <span class="type">void</span> __exit <span class="title function_">xxx_init</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">        <span class="keyword">return</span> platform_driver_unregister(&amp;xxx);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">module_exit(xxx_exit);</span><br><span class="line">module_init(xxx_init);</span><br></pre></td></tr></table></figure>


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